Hello,
I want to create a hibernate filter on collection which would filter the collection and only keep the one with last date. I was wondering how I can use the max function here in hibernate filter.
Thanks.

I think that you'd have to fetch the max date in a subquery. It would probably be easier to use order by(date, desc) wtih setMaxResults(1). You'd have to use setMaxResults even if you figure out the correct filter, because it might return more than one result.